Week 38 in 2026

WEEK
38

This week starts on Sunday, September 13, 2026 and ends on Saturday, September 19, 2026.

WEEK EUROPE & ISO
38

This week starts on Monday, September 14, 2026 and ends on Sunday, September 20, 2026.

Week 38 of 2026 begins on September 14, 2026 and ends on September 20, 2026. It covers days 257 to 263 of the year and falls in quarter 3.

Weeks since this week: 1

Week 38 of 2026 at a glance

Starts (Monday)September 14, 2026
Ends (Sunday)September 20, 2026
US week (Sunday to Saturday)38 (September 13, 2026)
MonthSeptember
QuarterQ3
Days of the year257–263
Year completed at the end of this week72.1%
Weeks left in 2026 after this week15
Weeks in 202653
Even or odd weekEven

All days in Week 38:

  • Monday, September 14, 2026
  • Tuesday, September 15, 2026
  • Wednesday, September 16, 2026
  • Thursday, September 17, 2026
  • Friday, September 18, 2026
  • Saturday, September 19, 2026
  • Sunday, September 20, 2026

Calendar for September 2026

September 2026
SuMoTuWeThFrSa
Week 3612345
Week 376789101112
Week 3813141516171819
Week 3920212223242526
Week 4027282930
USA Calendar

All Weeks in 2026:

Past & Future Week 38:

US and ISO week numbers

In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 38 of 2026. It runs from September 13, 2026 to September 19, 2026.

Even and odd weeks

Week 38 is an even week. Even and odd week numbers are used for alternating schedules such as shift rotas, school timetables, custody arrangements and waste collection.

Week 38 in other years

FromTo
Week 38 in 2024September 16, 2024September 22, 2024
Week 38 in 2025September 15, 2025September 21, 2025
Week 38 in 2027September 20, 2027September 26, 2027
Week 38 in 2028September 18, 2028September 24, 2028

How week numbers are counted

Most of the world numbers weeks according to the ISO 8601 standard. A week starts on Monday, and week 1 is the week that contains the first Thursday of the year, which is always the week that contains 4 January.

Week 1 of 2026 began on December 29, 2025. 2026 has 53 ISO weeks, because 1 January 2026 falls on a Thursday.

Because of this rule, the first days of January can belong to the last week of the previous year, and the last days of December can belong to week 1 of the next year.

In the United States, weeks usually start on Sunday and week 1 is the week that contains 1 January, so the US week number can differ from the ISO week number.

Frequently Asked Questions (FAQ)

When does week 38 of 2026 start and end?

Week 38 of 2026 starts on September 14, 2026 and ends on September 20, 2026 (ISO 8601, Monday to Sunday).

Which month is week 38 of 2026 in?

Week 38 of 2026 is in September.

What dates are in week 38 of 2026?

September 14, 2026, September 15, 2026, September 16, 2026, September 17, 2026, September 18, 2026, September 19, 2026, and September 20, 2026

How many weeks does 2026 have?

2026 has 53 ISO weeks, because 1 January 2026 falls on a Thursday.

Is week 38 an even or odd week?

Week 38 is an even week.

What is the US week number for this week?

In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 38 of 2026. It runs from September 13, 2026 to September 19, 2026.

Overview of Week 38

Week 38 of the year holds a unique place as it typically marks the transition from summer to autumn in the Northern Hemisphere. This week often brings a mix of warm days and cooler nights, signaling the end of the summer season and the beginning of fall. It's a time when many people start to shift their focus from summer activities to preparing for the upcoming colder months. In the Southern Hemisphere, it signifies the shift from winter to spring, bringing a sense of renewal and growth.

During Week 38, several notable events and observances occur. This week often includes the International Day of Peace on September 21st, which promotes peace and the cessation of violence worldwide. Additionally, the autumnal equinox usually falls within this week, marking the moment when day and night are approximately equal in length. These events set the tone for a week filled with reflection, preparation, and change.

Summary of Week 38

  • Important Dates: International Day of Peace (September 21), Autumnal Equinox
  • Common Themes: Transition, Reflection, Preparation
  • Activities: Seasonal preparations, community events, personal reflection

Major Themes of Week 38

Transition and Change

Week 38 is synonymous with change. In the Northern Hemisphere, the shift from summer to autumn is evident in the changing colors of the leaves, cooler temperatures, and shorter days. This transition period is a time for people to start preparing their homes and wardrobes for the colder months ahead. It's also a time for mental and emotional preparation, as the change in seasons can affect mood and energy levels.

Reflection and Peace

The International Day of Peace, observed on September 21st, is a significant event during Week 38. This day encourages individuals and communities to reflect on the importance of peace and to take actions that promote harmony and understanding. Activities such as peace marches, educational events, and community gatherings are common, fostering a sense of unity and collective responsibility.

Seasonal Preparations

As autumn approaches, many people engage in seasonal preparations. This can include tasks like harvesting the last of the summer crops, planting fall vegetables, and preparing gardens for the winter. It's also a time for organizing and decluttering homes, switching out summer clothes for warmer attire, and making any necessary home repairs before the colder weather sets in.

Significant Historical Events and Observances

International Day of Peace

Established in 1981 by the United Nations, the International Day of Peace is dedicated to promoting peace and non-violence worldwide. This day is marked by various activities, including peace education programs, community events, and moments of silence. It's a day for individuals and organizations to reflect on the importance of peace and to take steps toward creating a more harmonious world.

Autumnal Equinox

The autumnal equinox, which typically falls around September 22nd or 23rd, is a significant astronomical event marking the start of autumn in the Northern Hemisphere. On this day, day and night are approximately equal in length. Many cultures celebrate the equinox with festivals and rituals that honor the changing seasons and the balance between light and dark.

Interesting Facts and Cultural Insights

  • The autumnal equinox is also known as Mabon in some pagan traditions, a time for giving thanks for the harvest and preparing for the winter months.
  • In Japan, the autumnal equinox is celebrated as a national holiday called Shubun no Hi, a time for visiting family graves and holding family reunions.
  • In many parts of the world, Week 38 is a popular time for fall festivals, featuring activities like apple picking, pumpkin carving, and hayrides.

Activities and Practices for Week 38

Seasonal Decorating

One enjoyable activity during Week 38 is decorating your home for the fall season. This can include adding autumn-themed decorations like wreaths, pumpkins, and candles. These decorations not only enhance the aesthetic of your home but also create a cozy and welcoming atmosphere as the weather begins to cool.

Gardening and Harvesting

For those with a green thumb, Week 38 is an ideal time to harvest the last of the summer crops and prepare the garden for fall planting. Consider planting cool-weather vegetables like kale, spinach, and broccoli. This is also a good time to clean up garden beds and mulch to protect plants during the winter.

Personal Reflection

Given the themes of transition and reflection, Week 38 is a great time for personal introspection. Take some time to journal about your experiences over the past few months and set intentions for the upcoming season. Reflecting on your goals and making plans for the future can help you feel more grounded and prepared for the changes ahead.

Community Involvement

Engaging in community activities is another meaningful way to spend Week 38. Participate in local events, volunteer for community projects, or join a peace march in honor of the International Day of Peace. These activities not only foster a sense of community but also contribute to the well-being of society as a whole.

Outdoor Activities

With the weather starting to cool, Week 38 is a perfect time for outdoor activities. Go for a hike to enjoy the changing foliage, have a picnic in a local park, or take a scenic drive to appreciate the beauty of the season. Spending time in nature can be refreshing and rejuvenating, providing a much-needed break from the hustle and bustle of daily life.

Conclusion

Week 38 is a time of transition, reflection, and preparation. Whether you're celebrating the International Day of Peace, observing the autumnal equinox, or simply enjoying the changing seasons, this week offers numerous opportunities for meaningful activities and personal growth. Embrace the themes of change and renewal, and make the most of this unique and significant week of the year.